Intelligent Outdoor Inflatable Ring Main Unit
The intelligent outdoor inflatable ring main unit uses the vacuum switch as theswitchgear, SF6 gas box-type insulation, compact structure, small occupied spacebeautiful appearance, and coordinating and cooperating with the surrounding. As RVACring main unit uses the concept of fully sealing and insulation,
all switch parts in it as welas the high-voltage electrified body and structure part are sealed in the main cabinetfully, they will not be affected by the frost and dew, external polluted environment; theprotection level of main cabinet can reach lP67, and it is equipped with Cooperwaterproof cable head which can be touched to defend against the accidental flood inthe rainy area efficiently.
Specification Parameter
| Nominal voltage | kV | 12 |
| Rated current | A | 630 |
| Power frequency withstand voltage within 1 minute | kV | 42 |
| Lightningimpulse withstand voltage(BlL) | kV | 95 |
| Direct current withstand voltage within 15 minutes | kV | 53 |
| Power frequency withstand voltage within 1 minute under zero voltage | kV | 38 |
| Power frequency withstand voltage of the second circuit (within 1 minute) | V | 2000 |
| Powersupply voltage for electric operating | V | DC24 |
| Breaking current underrated load | A | 630 |
| Charging breaking current under rated cable | A | 10 |
| Breaking current under rated short circuit | kA | 20 |
| Making current under rated short circuit | kA | 50 |
| Withstand current for 3 seconds under rated short circuit | kA | 20 |
| Withstand current under rated peak | kA | 50 |
| Mechanical life | Time | 10,000 |
| SF6 gas rated pressure(20℃) | Mpa | 0.035 |
| Annualleakage rate of SF6 gas | % | <0.1 |
Product Advantage
1. Strong Environmental Adaptability
Designed with an all-insulated, fully sealed structure, they operate reliably in harsh conditions (rain, dust, pollution, salt spray, extreme temperatures). The IP67-rated SF6 gas chamber ensures excellent protection against moisture and condensation. This makes them ideal for coastal areas, industrial zones, and urban settings.2. Enhanced Safety and Reliability
All live parts (busbars, connectors, switches) are fully enclosed within a sealed SF6 gas compartment, eliminating exposure and the risk of electric shock (“touch-safe” design). They feature robust interlocking mechanisms and comprehensive protection against misoperation. SF6 gas provides superior insulation and arc-quenching properties.
3. Compact Design and Easy Installation
Their significantly smaller size and lighter weight compared to air-insulated switchgear simplify transportation, site handling, and installation, especially in space-constrained locations. The modular design allows for flexible configurations and future expansion.
4. Low Maintenance and Long Service Life
The hermetically sealed SF6 gas compartment (with extremely low annual leakage rate <0.25‰) and corrosion-resistant housing (often aluminum-zinc coated steel) enable a maintenance-free (or minimal maintenance) operation throughout their long lifespan. Integrated SF6 pressure gauges and low-pressure alarms provide remote monitoring capability.
5.Operational Intelligence and Flexibility
They are inherently prepared for distribution automation (DA/DTU/FTU integration), supporting remote monitoring, control, and fault detection for smarter grids. The modular design enables smooth expansion and reconfiguration to meet evolving network needs. Fully insulated plug-in cable connectors ensure safe and flexible cable termination. Components like high-cycle vacuum contactors or switches are suitable for frequent operation, as seen in demanding applications like offshore wind farms.
